| 摘要 |
<p>PURPOSE:To achieve a high accuracy by adding a reception time estimating device for estimating the reception time of a PCW signal to perform a calculation of a digital filter at a specified time estimated. CONSTITUTION:A received signal is passed through a preamplifier 2 and a band pass filter 3 and then, through a filter 20 to determine an envelope with an envelope detector 21. A maximum point detector 22 determine the time to maximize the envelope. A counter 23 counts the number of samples from the time and outputs a control signal to a register 24 and digital filters 251 and 252. The register 24 records and holds a sample value of the received signal and the digital filters 251 and 252 starts a calculation. A phase calculator 26 determines the phase of a PCM signal.</p> |
